People who own a humidor should be aware of the importance of maintaining its seal. If you have ever had cigars dry out because it has been too long since they were re-humidified, then you know how frustrating that can be! In this blog post, we will discuss some top humidor sealants and provide an epic guide to finding the best one for your situation.
Why humidors are going to leak?
- There are a few reasons why humidors might start to leak. One of the most common reasons is that the sealant has started to wear down over time.
- Another reason could be a change in temperature or humidity levels, which can cause the wood on the humidor to expand and contract. So we have dry humidor problems.
- And finally, if your humidor isn’t properly sealed when it’s first constructed, it will continue to leak over time. This problem frequently comes with glass top humidors because glass has bad thermal insulation properties.
Leaking Problem? No more with clear aquarium sealant!
Clear aquarium sealant is a great way to fix a leaking humidor. This type of sealant is designed specifically for use in moist and humid environments, making it the ideal option for repairing a humidor that is prone to leaks. It adheres strongly to surfaces, creating an airtight barrier that prevents water from seeping into your humidor and damaging its contents. In addition to being effective at sealing leaks, clear aquarium sealant is also easy to apply. You can simply squeeze out some of the sealants onto the seams or cracks in your humidor and smooth it into place using your finger or a small spatula. This fast and simple application process makes clear aquarium sealant one of the best options for keeping your humidor in good condition. If you are looking for a reliable way to fix a leaking humidor, then clear aquarium sealant is worth considering. Not only does it create an airtight barrier against moisture, but it is also easy to use and affordable compared to other solutions, making it the perfect choice for any humidor owner in need of a quick fix.
How to choose a silicone sealant for a humidor?
Silicone sealant is an important component of a humidor, as it is responsible for keeping your cigars and the humidor itself safe and protected. When choosing silicone sealant for a humidor, it is important to look for one that is safe for cigars and that will not damage or compromise the integrity of your humidor or its contents. Some key factors to look for when selecting silicone sealant include:
- A high level of moisture resistance. Sealants with superior moisture resistance will help protect your cigars from humidity and other environmental factors, preventing them from drying out or becoming damaged over time.
- A non-toxic formula that won’t release harmful chemicals into the air or onto your cigars. This can help ensure that you can safely enjoy your cigars without any risk of exposure to toxic chemicals or compounds in the sealant.
- A mildew-resistant formula that will help prevent mold growth in the humidor, which can be especially problematic for cigars made with natural materials like tobacco leaves. Look for a silicone sealant that has been specifically designed to inhibit mold growth, so that you can rest assured knowing your cigars are protected from this type of deterioration.
When selecting silicone sealant for a humidor, it is also important to consider whether you need a clear or colored sealant, as well as how much coverage you may need based on the size of your humidor and its interior space. Regardless of which type of silicone sealant you choose, however, it is essential to make sure that it is safe and high quality to keep your cigars protected and preserved over time.
Seth Lee
Cigar Expert
Pro Tip: I prefer to use silicone for aquariums, it is the best solution for leaking problems. So here are my top sealants for any humidor situation.
SELL Aquarium Silicone Clear Sealant: Top-fixing leaky humidor product
SELSIL Aquarium Silicone Clear Sealant is a 100% silicone polymer adhesive that conforms to the ISO 11600 –F&G–25 LM standards. It is used in aquarium manufacturing and offers an excellent grip on glass without using an additional primer. This transparent silicone sealant also offers insulation for many kinds of materials, has a strong bond, cures quickly, and can be used for multiple purposes.
My experience
I have always struggled with keeping my humidor properly sealed, as it seemed to constantly leak and lose moisture. After doing some research online, I came across SELSIL Aquarium Silicone Clear Sealant, which is a 100% silicone polymer. I decided to give this product a try and was pleasantly surprised by how well it worked. Not only did it effectively seal all of the cracks and leaks in my humidor, but it also added an extra layer of protection against future damage. Overall, I would highly recommend this product to anyone looking for an effective solution to their humidor sealing issues! Pros
- 100% silicone polymer
- Used in aquarium manufacturing
- Conforms to ISO 11600 –F&G–25 LM standards
- Highly elastic and flexible
- Resistant to ozone, ultra-violet radiation, and extreme temperatures
- Fast curing time
Cons
- may not work with porous surfaces
- bonding may be weak
Marineland 31003 Silicone Squeeze Tube Review – What to do if your humidor isn’t working right?
GramMade in the United States, this silicone sealant is perfect for repairing leaky aquariums, humidors, or broken ornaments. This includes resealing any cracks to maintain the natural humidity in your enclosure or drying out newly acquired treasure. Simply apply a thin layer of the silicone along the crack before reassembling whatever you’re trying to repair and it will be as good as new and much faster than other repair methods!
Top benefits of Marineland 31003 Silicone Squeeze Tube
It is a product made by Marineland, a trusted brand that has been around for over 75 years. It works well on aquariums, humidors, and other types of enclosed spaces where humidity needs to be maintained. Dries clear and waterproof so doesn’t collect any moisture which makes it easier to maintain than some other products such as those beads or crystals that usually will hold onto the water they come into contact with. Pros
- A trusted brand that has been around for over 75 years.
- It’s good for enclosed spaces like aquariums, humidors, and other places where the humidity needs to stay the same.
- This silicon will dry clear and it is waterproof.
Cons
- It is very expensive for something that can be made at home at half the cost
- The squeezer tube doesn’t squeeze out all of the liquid
My Experience
Although I have a few different humidors, my main one is a large Spanish cedar box that has been in the family for over 40 years. The humidity has always been stable within the cigar box but lately, it just hasn’t been as full as I would like to see it. When I first started storing cigars I would use those black foam “shreds” you could buy from Cigars International but quickly realized that they didn’t work well and were extremely messy to clean up when they dried out so decided to try something else instead. I have tried several other things including beaded jars filled with distilled water which was probably my best option but it was a little bit of a pain to keep having to top them off. I have also tried those small crystal humidifiers that you can put into the box but they don’t work well in my opinion, either. I think the main reason is that the large Spanish cedar humidor doesn’t have any tight spaces or crevices for the humidifier to “stick” onto and hold the humidity in. 
I had pretty much resigned myself to just living with a less-than-perfect humidor situation until I happened to come across an article on using silicone sealant as a way to repair and maintain a humidor. After doing some more research on the subject, I decided this was probably the best option for me since I wasn’t exactly ready to buy a new humidor and it seemed like this was the most economical option as well. I bought the Silicone Squeeze Tube 31003 from Amazon for about $8 and decided to give it a try. I followed the instructions on the tube which said to make sure that my cigar box was completely dry before using the silicone and to apply a thin layer of sealant to any cracks or leaks that I may have. I also put a small bead around the edge of the humidor lid where it seals against the box itself. After doing all this, I let it dry for about 24 hours before putting my cigars back in. The great thing about using this silicone is that it dries obviously and is waterproof so it doesn’t attract any moisture to itself. I have had my humidor sealed with this for several months now and am extremely pleased with the results. My humidor has remained at a level of around 70% humidity which is perfect where I need it to be without having to worry about topping it off with distilled water or anything like that. You can find more Marineland Silicone Squeeze Tube – 31003 reviews at this link. If you are having trouble with your humidor, I would recommend giving this silicone sealant a try as it is an easy and affordable way to get your humidity back under control.
Should you buy Marineland Silicone Squeeze Tube?
Marineland 31003 Silicone Squeeze Tube is a great option for those that are having difficulty maintaining their humidor or other enclosed spaces. It’s waterproof and clear so it won’t ruin the aesthetics of your space, either. If you’re looking for an affordable way to fix your problem, I would recommend giving this silicone sealant a try!
Clear Aquarium Silicone Sealant – How ASI Aquarium Silicone Sealant is different from other sealants
What is Clear Aquarium Silicone Sealant?
Clear Aquarium Silicone Sealant is Designed for use with fresh and salt-water aquariums or a Vivarium. ASI Aquarium Silicone Sealant forms strong cohesive bonds to glass without the need for primers, preventing future leaks and corrosion on your expensive equipment. Formulated for use with fresh and salt-water aquariums or a Vivarium.
ASI Aquarium Silicone Bonding Compound is formulated as a high modulus component RTV Silicone Sealant which is a non-slump sealant and can be applied to vertical surfaces without flowing or sagging. It reacts well in normal room temperature environments up to 50 degrees Celsius (122 degrees Fahrenheit) so its fully cured state will be resilient against many climates! What does this mean? This means that it can be used almost anywhere and can withstand high heat and humidity. It is commonly used as a sealant for:
- Aquariums – glass tanks, acrylic aquariums, vivariums, terrariums
- Humidors
- Ponds
- Birdbaths
- Fountains (indoor or outdoor) FDA-approved food-safe material
No need to prime with ASI Aquarium Silicone Sealant, unlike competitive products!
Top benefits of Clear Aquarium Silicone Sealant
You can make an aquarium out of glass, plastic, or a vivarium. ASI Aquarium Silicone Sealant is used with fresh and salt-water tanks or a vivarium. It seals the glass without needing to prime it which will help prevent leaks and corrosion on expensive equipment later on. Exellent decision for glass humidors! 
- ASI Aquarium Silicone Sealant forms strong cohesive bonds to glass without the need for primers, preventing future leaks and corrosion on your expensive equipment.
- Formulated for use with fresh and salt-water aquariums or a Vivarium. ASI Aquarium Silicone Sealant is ideal in humid environments due to its high modulus response characteristic
- Can withstand harsher climates than many sealants
- No need to prime with Clear silicone like other brands!
Pros
- No need primers
- You can use it with fresh and saltwater
- Can withstand harsher climates than many sealants
Cons
- Not recommended for use on vertical surfaces in humid climates
My experience using Clear Aquarium Silicone Sealant for humidor
I had never used Clear Aquarium Silicone Sealant before, but I was excited to try it because I needed a sealant that could withstand harsher climates. The first time I used it, I was impressed with how easy it was to use and how well it bonded to the glass. I didn’t have to prime it, which saved me a lot of time, and it cured quickly so I didn’t have to wait long to use my aquarium. I’m so happy with how well this sealant worked and would recommend it to anyone looking for an easy-to-use sealant that can withstand harsh climates.
Should you buy Clear Aquarium Silicone Sealant?
Clear Aquarium Silicone Sealant is an easy-to-use sealant that can withstand harsh climates. It’s also formulated for use with fresh and salt water or a vivarium. You won’t need to prime it because the silicone reacts well in normal room temperature environments up to 50 degrees Celsius (122 degrees Fahrenheit) which means you can use this product almost anywhere! If you’re looking for a new aquarium sealant, ASI Aquarium Silicone Sealants are worth considering.
Henkel 908570 2.7 oz Tub Clear Silicone Waterproof Sealant Review – How I Fixed My Humidor Leak With This Product
What is Henkel 908570 2.7 oz Tub Clear Silicone Waterproof Sealant?
Henkel 908570 2.7 oz tub Clear Silicone Waterproof Sealant is a versatile, high-quality sealant that can be used to fill gaps for a lasting bond on almost any surface material. So whether you need it for sealing or repairing door frames, windows, vents, toys, appliances, gaskets, or weather-stripping – this product will not disappoint! Keep scrolling down to see what other great features make this a top pick. Everyday uses: seal and repair shingles leaks around chimneys and vents; mend pots and pans rips with hinges; stop outside air from leaking through window screens. Cigar safe: This sealant is humidor friendly as well as cigar smoker’s safe!
Top Benefits
- High-quality sealant
- Eco-friendly
- Durable and versatile
- Bonds to a variety of surfaces
- No cracking, peeling, or shrinking
Pros Henkel 908570 2.7 oz Tub Clear Silicone Waterproof Sealant is also:
- Non-toxic
- Safe for indoor and outdoor use
- Low VOCs (Volatile Organic Compounds)
Cons
- The sealant is sticky when in liquid form
- It is difficult to remove the sealant from clothing and hands
How to use Henkel 908570 2.7 oz Tub Clear Silicone Waterproof Sealant:
- For best results, make sure the surface is clean and dry before application.
- Apply sealant using a caulking gun and smooth out with a wet finger or damp cloth.
- Allow 24 hours for the sealant to cure before using.
- For a longer-lasting bond, apply a coat of paint over the sealant.
My experience using Henkel
I was having some problems with my humidor, as it was leaking and not holding the humidity level that I wanted. I did a little research and found that Henkel 908570 2.7 oz Tub Clear Silicone Waterproof Sealant could fix the problem. I went to my local hardware store and picked up a tube of the sealant. The process of using the sealant was very easy – I just had to clean the surface, apply the sealant using a caulking gun, and then smooth it out with a wet finger or damp cloth. After allowing 24 hours for it to cure, I was able to use my humidor again and it was working perfectly! This product is worth a try if you are having problems with a leaky humidor.
Should you buy Henkel 908570?
Henkel 908570 2.7 oz Tub Clear Silicone Waterproof Sealant is a versatile, high-quality sealant that can be used to fill gaps for a lasting bond on almost any surface material. So whether you need it for sealing or repairing door frames, windows, vents, toys, appliances, gaskets, or weather-stripping – this product will not disappoint!
Best Humidor Sealants in 2025: Comparison Table
[table id=22 /]How to test the seal on the humidor?
If you suspect that your humidor might be leaking, there are a few things you can do to test for it. One easy way is to put a piece of paper inside the humidor and wait 24 hours. If the paper is wet, then you know that the humidor is leaking. Another way to test for leaks is by using a water bottle. Simply spray a little bit of water into the humidor and if it beads up on the inside, then you know there is a leak.
Popular The Dollar Bill Test for Leaking humidor
Desktop humidors are easiest to test for leaks with this dollar bill experiment. It’s a little difficult to travel humidors.
- Take a dollar bill and flatten it out as much as possible.
- Close and seal the humidor lid halfway with a dollar bill.
- Try to remove the dollar bill by delicately tugging it from the outside. If it comes out readily, you probably have a seal issue.
- Pull the dollar bill on all sides of the humidor, trying to get it out. There should be equal amounts of “pull” all around. A leak in the seal’s seal is indicated by where it’s easier to pull.
It shouldn’t be difficult to extract the dollar bill using any method, but the major goal is that moisture may slip out as quickly as it enters.
The Flashlight Test for Humidor Leaks
The dollar bill test and the flashlight test are both useful for detecting a leak in a humidor. If you have a glass top humidor, this will work; otherwise, it won’t. 
- Find a flashlight or use your phone’s flashlight app.
- Turn out the lights in the room and use the flashlight to scan the exterior crack marking the top/bottom of the lid.
- You shouldn’t be able to see any light coming through the gap. If that’s the case, your leak is close by.
How to seal a humidor?
One way to keep your cigars fresh is to invest in a humidor. A humidor is a special box that regulates the humidity and temperature inside, providing the perfect environment for storing cigars. If you’re new to using a humidor, you may be wondering how to seal it properly. Here are a few tips:
- First, make sure that the interior of the humidor is clean and dry. Any moisture or dirt could damage the cigars. Once the humidor is clean, add a small amount of water to the humidifier. The amount of water will depend on the size of the humidor; generally, you’ll need about one ounce per 25 cigars.
- Next, close the lid of the humidor and leave it sealed for 24 hours. This will allow the humidity levels to stabilize. After 24 hours, open the lid and check the cigars. If they feel dry, add a bit more water to the humidifier. Repeat this process until the cigars are properly moistened.
- Finally, once you’re satisfied with the humidity levels, be sure to leave the lid cracked open slightly to prevent the cigars from becoming too moist.
How can I fix my humidor seal?
If your humidor has started to leak, there are a few things you can do to try and fix the seal. One option is to use a Humidipak or another re-humidification system to bring the humidity level back up. If that doesn’t work, you might need to reseal the humidor with some new sealant. There are many different types of sealants available, so be sure to do your research and find the one that is best suited for your humidor.
- Purchase non-toxic, odorless silicone.
- Remove the cigars and place them in a container with a Boveda pack for temporary storage.
- The humidor’s interior has a leak or a glass top. Because the exterior may not be as effective, you don’t want to ruin the appearance of your humidor.
- Leave the humidor’s lid open for three days to allow the silicone to cure.
- For the second time, install the humidifier and hygrometer in the humidor again for 24 hours so that humidity levels may return to approximately 70%.
- Return the cigars to your humidor which is free of leaks.
Glass top humidor problems
Glass top humidors are popular among cigar smokers because they offer a sleek, sophisticated look that complements any decor. However, these humidors can also have some major downsides. One common problem is that they can be prone to leaking, especially if the seal between the lid and the base of the humidor is not tight enough. This can cause your cigars to dry out and lose their flavor, which is very disappointing for cigar aficionados. In addition to being prone to leaks, glass top humidors may also be more difficult to maintain than other styles of humidors. Because they are typically made from a single piece of glass or acrylic, it can be difficult to track humidity levels or add moisture to the box if needed. Furthermore, some humidors may not include an adequate hygrometer or other monitoring tools, making it difficult for you to keep tabs on your cigars’ conditions. If you do decide to invest in a glass top humidor, you must take steps to prevent leaks and monitor humidity levels carefully. Some possible solutions might include adding a layer of insulation around the bottom of the unit or using specially designed absorbent pads inside your humidor. Additionally, it’s important to keep in mind that these devices often require more frequent maintenance than other types of humidors, so be sure you put in the time and effort required for proper upkeep.
Best inexpensive humidor for sealing
As for me, it is Woodronic Handmade Cigar Humidor Cabinet. The Woodroinic Handmade Cigar Humidor keeps your cigars in the best condition, from their freshness and aroma to their moisture level. This cabinet can hold up to 200 cigars with a magnetic seal that keeps it tightly closed. You’ll also get a see-through door that lets you take a look at your collection without letting out any of the humidity while keeping track of its RH level through an electronic hygrometer. The humidor is designed with antique features for a traditional look and comes ready to assemble so you know exactly what materials are going into your cabinet. It’s backed by Woodronic’s 1-year warranty on parts and customer service – all arguments for investing in this cigar storage solution today.
Final Thought about best humidor sealants
So as you can see, there are many solutions on the market and I believe that you can find full-enough products for your humidor! Of course, you can find other products for your situation but believe me: choose from my best and your cigars will thank you!
FAQ Cigar Humidor Sealants
How do changes in season affect the performance of a cabinet humidor, especially concerning its ability to hold humidity?
Seasonal changes often lead to fluctuations in external temperature and humidity, which can challenge the cabinet humidor’s capacity to maintain a stable internal environment. In dry seasons, for instance, the humidor might struggle to hold humidity, necessitating more frequent refills of the humidification device or adjustments to the settings.
Why is ensuring a good seal important when setting up your cabinet humidor, and what could be the consequences of a bad seal?
A good seal is vital for a cabinet humidor because it prevents the exchange of air inside the humidor with the outside environment, maintaining the desired temperature and humidity levels for cigar preservation. A bad seal would allow the external air to infiltrate, disrupting the internal climate, and potentially leading to cigars drying out or developing mold.
What are some common suggestions on cigar forums for dealing with a warp in the hardwood of your cabinet humidor?
Cigar enthusiasts on cigar forums often recommend using weather stripping or a similar sealant to reinforce the seal around areas affected by a warp. If the warp is severe, some might suggest consulting a professional for repairs or using a humi-seal strip specifically designed for humidors.
How do you calibrate a digital hygrometer for use in a cabinet humidor, and why is this process important?
Calibrating a digital hygrometer typically involves using a salt test or a calibration kit. This process is crucial to ensure the device accurately reads the humidity levels, allowing for proper adjustments to be made to the humidification device and maintaining ideal cigar storage conditions.
What steps can be taken if the drawer in your cabinet humidor does not have a great seal?
If the drawer lacks a great seal, try using weather stripping or tape around the edges to improve the closure. Alternatively, adjusting the position of the drawer or the items inside it might also help achieve a tighter seal.
How does the cedar lining in a cabinet humidor contribute to maintaining temperature and humidity?
Cedar lining in a cabinet humidor helps regulate humidity by absorbing and releasing moisture in the air inside, depending on the need. It also provides a favorable environment for cigars by imparting a pleasant aroma and helping prevent pest infestations.
Why is it recommended to use a Cigar Oasis or a similar high-quality humidification device in a large cabinet humidor?
A Cigar Oasis, or equivalent high-quality humidification device, is recommended for large cabinet humidors because they are more reliable in maintaining consistent humidity levels across a larger space, especially important when the goal is to preserve a substantial collection of premium cigars.
Is using food-grade silicone as a sealant safe for creating a better seal on a cabinet humidor?
Yes, using food-grade silicone is a safe and effective method to create a better seal on a cabinet humidor. It’s non-toxic, resistant to temperature changes, and won’t impart any harmful chemicals or odors to the cigars.
What does it mean when someone says “javascript is disabled” on my browser while I’m trying to view cigar forums, and how do I proceed for a better experience?
“Javascript is disabled” means that your web browser is not currently set up to run JavaScript, a programming language that websites, including cigar forums, use to offer interactive elements. For a better experience, please enable JavaScript in the settings of your web browser before proceeding.
What are some creative solutions, like using a bottle cap, that cigar enthusiasts recommend for dealing with a humidor that doesn’t seal well?
Creative solutions proposed by cigar enthusiasts include using a bottle cap or similar items as spacers to correct a humidor lid that doesn’t close properly, applying weather stripping to improve the seal, or using additional humidification elements, like a small, damp sponge, to maintain humidity in case of a minor seal issue.
Can the use of food-grade desiccants in a humi help regulate temp and humidity levels?
Indeed, food-grade desiccants can be used in a humi to help control temp and humidity levels. These desiccants are designed to absorb excess moisture, which can be particularly helpful during humid months or in damp climates to prevent the over-humidification of cigars. Since they are food-grade, they won’t introduce any harmful chemicals to your cigars.
If the temp in my humi consistently reads higher than optimal, what steps can I take, and are there any food-grade products that can assist?
If the temp in your humi is consistently higher than desired, it’s critical to first ensure it’s placed out of direct sunlight and away from any heat sources. To cool it down, you can try using food-grade moisture absorbers to reduce humidity, which can indirectly help lower the temp. Additionally, you might consider investing in a thermoelectric cooler or a humi with built-in temperature controls for more precise management.
How do food-grade sealants compare to regular sealants when dealing with a humi that has temp control issues?
Food-grade sealants are considered safer for use with a humi that experiences temp control issues because they don’t emit gases or contain chemicals that could potentially contaminate the cigars. They are designed to be safe for contact with consumable products, making them an excellent choice for sealing gaps or cracks in a humi, ensuring a more stable internal temp, and maintaining the integrity of the cigars inside.
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